Started my 15 Pro S 800 after putting 50 miles on and leaving it sit for an hour after startup it stalled and felt like it was seized (hard to pull) after that I pulled the side cover and checked the primary and it spun ok and then pulled fine and fired right up. When I started riding the rpm would not drop at idle sat at 3500! I shut it back off restarted and rpm was ok until clutch engagement then it wouldn’t drop! I pulled side cover and it checked primary again and it was loud and looked out of balance….Towed it back home! Any Ideas?TIA